r/IGCSE Resources
ATP (Alternative to Practical) Guide to
Cambridge IGCSE™
Biology (0610)
by Kaushik Reddy & Zhan Xuan Chong
1st edition, for examination until 2025
Version 1
Table of Contents
Page no.
Drawings & Magnification
2
Food Tests & Labellings
3
Precautions & Source of Error
4
Hazards & Drawing a Graph
5
Designing an Experiment
5-6
Methods, Controls and their Uses
6
Sample Question
7
Common Independent Variables
9
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Drawings
General Rules:
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6.
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Don’t draw any details. Try to draw only outlines. (Follow instructions)
Take care of any labels that are asked in the question.
NO SHADING !!
Draw the drawing at least 50% larger than the original image provided.
Don’t use a ruler or a compass to draw, and don’t draw broken lines.
Read the question carefully to see if any specific segment is required.
Don’t draw individual cells !!
Don’t draw the surrounding box of the image.
Magnification:
In IGCSE Biology Paper 6, typical drawing and calculation questions always
follow. You need to know the magnification formula. This Question typically has
2-3 marks, which is pretty simple if you know the formula. (1 mm = 1000 µm)
If the image size (µm) and magnification values are given and ask you to find the
Actual size (µm), use the Magnification (X) triangle to see the value:
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Food Tests
Test for starch:
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Add drops of iodine solution
Observe colour change
Positive result: Blue - Black Coloured Solution
Negative result: Brown Coloured Solution
Test for proteins:
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Add few drops of Biuret reagent
Observe colour change
Positive result: Mauve or Purple Coloured Solution
Negative result: Blue Coloured Solution
Test for Reducing Sugars:
● Add Benedict's solution and heat it
● Observe colour change
● When reducing sugars are detected in a solution, the colour change
happens based on the increasing concentration of sugar so blue → green
→ yellow → orange → red
● Positive result: Brick-Red Coloured Solution
● Negative result: Blue Coloured Solution
Test for fats:
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Known as the Emulsion Test
Crush the food sample in a mortar with ethanol
Take a sample in a test tube
Add drops of distilled water
Observe a milky-white emulsion showing the presence of fats
Labellings
● Labels should point directly to the image or specific part
● Use a ruler to draw the label line.
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Precautions
When doing a experiment planning question in the biology paper 6, you
should know all the precautions and how to avoid them:
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Take readings with eye perpendicular to scale (avoid parallax error)
Take readings from the bottom of the meniscus
Leave all test tubes in a water bath to equilibrate
Hot test tube (Use tongs to hold the test tube)
Stir a solution to distribute all the components evenly
While taking readings from a measuring cylinder, place it on a flat surface
Wear a lab coat
Stand while performing experiment
Don’t expose an alcohol/reagent to a flame directly; heat it using a water
bath
Use burette/pipette instead of measuring cylinder
In photosynthesis experiment, use a heat shield (beaker of water) placed
between the plant and the
lamp to prevent the temperature from changing due to the changing light
intensity
Heat using water bath (often used in Benedict’s test for reducing sugars)
While using a knife use a solid surface to cut on, cut away from fingers
Sources of errors
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The same type of plant/fruit may not be used; use same species
Measurement Error (Use a graduated pipette)
Water loss from tubes was not accounted for; cover the tubes
Reuse of syringe; (causes contamination) use a new syringe each time
A subjective/non-quantifiable variable was measured; measure a more
quantifiable variable for accurate results
Subjective Colour Nature (Use a colorimeter)
No repeats; repeat the experiment 3 times and find the average (to
remove anomalies)
Mass/volume/size/shape of pieces is not the same
Uneven crushing; use a mortar and a pestle
Volume of each drop could vary; measure volume used instead of number
of drops
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● Temperature of water may change; maintain water temperature using a
thermostatically controlled water bath
● Heat may be lost through gaps in lid/cork; make sure lid perfectly fits
container
● When a variable (eg potato) is cut into smaller pieces, the smaller pieces
are not measured into equal sizes
● Number of bubbles counted; measure volume of gas as the volume of each
bubble may vary
Hazards
These are the stuff you should always look out for when experiment planning,
hazards are not much but they will still get you the point:
● Cutting with a knife may injure hand; cut on a surface and away from hand
gloves
● H202 is corrosive; use gloves and goggles while handling it
● While exhaling through a tube into e.g. lime water, there is a risk of lime
water being swallowed
● Iodine solution can stain clothes, ensure gloves and safety goggles are
worn.
Drawing Graphs
Use a sharp pencil
Label both axes with units (IV on the x-axis, DV on the y-axis)
Labels should be in the form “quantity/units”
Choose the appropriate scale
Use crosses “(×)” or “⊙” to mark the data points (for scatter graphs)
Graph should cover at least half the grid
Draw a line of best fit that can fit through most of the points as possible
(for scatter graphs)
● Join the points (for line graph)
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Designing an Experiment
Coming to the final part of this booklet, how do you design an experiment?
The Paper would consist of an example, and they would ask you to design an
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experiment based on the example provided. Combining everything you have
learned above, I will show you how to do an experiment planning question.
General Information:
Detail
Marks Allotted
Independent Variable
1
Details of Method given/new method
1
Constant Variable
2
Safety Precautions
1
Dependent Variable
1
Method, Controls & their uses:
Method
Use
Gas Syringe or Delivery Tube
Measuring the volume of liquids
Ruler to measure the length of foam
produced
Measuring the rate of reaction by measuring the
volume of product made.
Cutting plant stem sections every
specified amount of time
Measuring the rate of water uptake every set
amount of time
Counting the number of bubbles
produced per unit time
Measure the rate of reaction by measuring the
volume of gas produced
Measure the mass of a potato stick
before and after putting in into a
solution
Measuring the volume of water that is lost and
gained per unit time
Measuring the height a piece of dough
has risen
Measuring the rate of reaction in the piece of
dough by measuring its change in height
Controls
Method
Temperature
Thermostatically regulated water bath
pH of the Solution
Using a buffer solution
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Volume of Solution
Measuring Cylinder or Gas Syringe
Size of Leaves
Square Grid
Time
Timer or Stopwatch
Concentration
Same concentration of (named solution)
Same diameter or size of test tube
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Additional Tips:
● Stage 3 or more variations for the independent variable (Eg - 5
Concentrations, 5 Species, 5 Acids).
● You can write either in a paragraph or bullet point form.
● Don’t spend more than seven minutes on the question.
Sample Question (6 marks)
Tips:
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Use this mnemonic: I Don’t Care So Run Away (IDCSRA)
IV – State the independent variable, describe how you are going to change
it (include names of apparatus), State the values with units
DV – State the dependent variable, State the units, State how you are
going to measure it
CV – State three different control variables, describe how you are going to
control them
Safety – State a safety measure and how would you eliminate the risk
Repeat – State Repeat the experiment three times
Average – State that you would calculate an average (Numerical Data)
Exemplar Answer:
● Prepare 20cm3, 40cm3,60cm3,80cm3 and 100cm3 of beetroot juice.
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Consume the beetroot juice at 2 PM everyday
Measure the length of time the athlete can run at their maximum speed
Concentration of beetroot juice
Age, Sex, the diet of athlete
Same Environment or Conditions of Exercise
Repeat with the same individuals for many trials
Medical Staff should be present
Marking Scheme:
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Common Independent Variables
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Acknowledgements and Information:
© UCLES 2018 as the publisher of the Cambridge IGCSE™ Biology (0610/0970) syllabus
© r/IGCSE Resources 2023, authored by Kaushik Reddy & Zhan Xuan Chong
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